condition mean min max ZT0-3 15.918899999999999 15.8098 16.028 ZT4-7 8.20006 8.20006 8.20006 ZT8-11 10.986855 10.986855 10.986855 ZT12-15 0 0 0 ZT16-19 11.80625 11.80625 11.80625 ZT20-23 14.4346 14.4346 14.4346